#include<stdio.h>
int main()

{
 printf("Hello world\n");
 printf("Hello world\n");
 printf("Hello world\n");
 printf("Hello world\n");
 printf("Hello world\n");
 printf("Hello world\n");
 printf("Hello world\n");
 printf("Hello world\n");
 printf("Hello world\n");
 printf("Hello world\n");
 printf("Hello world\n");
 printf("Hello world\n");
 printf("Hello world\n");
 printf("Hello world\n");
}
